public class Solution3 {
    public static void main(String[] args) {
        int[] nums = {1,2,3,1};
        int peak = findPeakElement(nums);
        System.out.println(peak);
    }
    public static int findPeakElement(int[] nums) {
        int left = 0;
        int right = nums.length - 1;
        while(left < right) {
            int mid = left + (right - left) / 2;
            if(nums[mid] > nums[mid + 1]) {
                right = mid;
            }else {
                left = mid + 1;
            }
        }
        return left;
    }
}
